xcode can't add additional project into workspace

Question

When adding a new project into workspace it is not possible to expand it, it is not compilable, and it's related files are not accessible, it seems as if xcode treat it as a resource file ( although it is able to resolve the proper icon ).

This is the way I add the proj

1. xcode->File->Add Files to "%ProjName%"
2. Select the project file

What am I doing wrong here ?

Answer 1

The problem was that I had the project being added opened in another IDE, having that other IDE closed resolved the problem